RT journal article
T1 Application of Direct Thermal Desorption–Gas Chromatography–Mass Spectrometry for Determination of Volatile and Semi-Volatile Organosulfur Compounds in Onions: A Novel Analytical Approach
A1 Velasco González de Peredo, Ana
A1 Vázquez Espinosa, María de las Mercedes
A1 Espada Bellido, Estrella
A1 Ferreiro González, Marta
A1 Carrera Fernández, Ceferino Adrián
A1 Palma Lovillo, Miguel
A1 Fernández Barbero, Gerardo
A2 Química Analítica
K1 Allium cepa L.
K1 direct thermal desorption–gas chromatography–mass spectrometry
K1 multi-response optimization
K1 onion
K1 organosulfur compounds
AB The population is now more aware of their diets due to the connection between food andgeneral health. Onions (Allium cepa L.), common vegetables that are minimally processed and grownlocally, are known for their health-promoting properties. The organosulfur compounds present inonions have powerful antioxidant properties and may decrease the likelihood of developing certaindisorders. It is vital to employ an optimum approach with the best qualities for studying the targetcompounds to undertake a thorough analysis of these compounds. In this study, the use of a directthermal desorption–gas chromatography–mass spectrometry method with a Box–Behnken designand multi-response optimization is proposed. Direct thermal desorption is an environmentallyfriendly technique that eliminates the use of solvents and requires no prior preparation of the sample.To the author’s knowledge, this methodology has not been previously used to study the organosulfurcompounds in onions. Likewise, the optimal conditions for pre-extraction and post-analysis oforganosulfur compounds were as follows: 46 mg of onion in the tube, a desorption heat of 205  Cfor 960 s, and a trap heat of 267  C for 180 s. The repeatability and intermediate precision of themethod were evaluated by conducting 27 tests over three consecutive days. The results obtained forall compounds studied revealed CV values ranging from 1.8% to 9.9%. The major compound reportedin onions was 2,4-dimethyl-thiophene, representing 19.4% of the total area of sulfur compounds. Thepropanethial S-oxide, the principal compound responsible for the tear factor, accounted for 4.5% ofthe total area.
PB MDPI
SN 1424-8247
YR 2023
FD 2023
LK http://hdl.handle.net/10498/32442
UL http://hdl.handle.net/10498/32442
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 05-nov-2026